Chrome (running latest official and tested the latest beta) accesses the site without issue.

Firefox (running latest version) states the certificate is invalid, but has the ability to override.

Since Vivaldi is based on Chromium the same as Chrome, why is it having trouble accessing the site when Chrome doesn't? Why isn't there an override?

And yes, I know about the whole Symantec thing, but that has passed since last year and is evident by the fact Chrome doesn't have an issue.

So, any ideas on how to get the override back or get the site to work as it has proven to in other browsers?

Not that all the UI stuff isn't nice to have, but it isn't needed and it seems too much focus is being put on that (such as the completely unnecessary and useless Razor Chroma, something practically no one has) and not enough on making truly functioning browser (I've submitted 3 bugs, 2 of which are minor, thus far with only one receiving a reply thus far... and yes, I know there are more pressing bugs to deal with).

I believe the Vivaldi team can make one of the best browsers out there, but not if they waste time on unnecessary things and especially not if they regress (thus falling behind other browsers) on various other things in the process.

@Pesala I've tried adjusting settings, including with full and without any form of blocking/filtering. Tried in private browser mode on both full install and standalone install (which there appears to be a drastic functionality difference between the two). Tried with and without VPN. Tried on multiple computers, including a linux machine.

Results are the same, site is inaccessible.

Third-party cookies mean nothing when there are none. It is a government-DOD website after all.

@LonM Yes, but where is the override to get around it? That is the main issue: that there is no override (going an hunting down certificates is not a solution). I don't care about the certificate, nothing important can or is being entered onto that site, it is merely a lookup page. Because of that, the specific page doesn't technically really need a certificate at all. But regardless of that, there should always be an override.

Contacting webmasters isn't the simplest nor the most reliable thing out there, especially government ones.

@cmstazan I'm not sure. Trying the link just now, I get the option to bypass the warning.

Do you have any 3rd party software installed on your machine or network that might be interfering? Maybe if you do, they don't recognise vivaldi and think it is malware so are messing with the connection.